Ignition problem

Hello everyone,
I would like to help me to know, what can be the causes for my double Pick Up truck D21 Mod 2002 to not start.

DESCRIPTION.

When the fault of my truck began the battery no longer retained the current, then I changed it for a new one. (It was stopped two days without battery until buying a new one)

after it is time try to start it but I did not turn on.

Check the precion of the gasoline pump and if I had a precion.
I changed the gasoline filter,
the spark plugs. (When the spark plugs were changed, they were wet)

then I went to a mechanic-ectric. And Czech:
The gasoline filter
The
spark plugs
The spark plug cables
coil
cover the coil
the engine time (in this test as the truck wanted to turn on but did not give)

and another thing that function has the gasoline regulator that is next to the injectors which has two outputs, I understand that one is the return of gasoline but the other that makes the other that reaches the venture.

Friend to be sure first of anything Check if there is spark in the spark plugs, this spark has to be strong and blue, if there are checker spark that comes fuel to the combustion camera, if there are then you measure the engine compression, this will reflect if you have prostheses of the motor, that as to start guiding you where to look for because if you only say it does not start can be many things, the electric one that exists cherry Are they in good condition? That feet that you say is called a fuel precion regulator has a return output to the pond and another exsita to the mebrane or active by basio, if the precion on the ramp increases lebanta the menbrane and lets the exile of fuel to pond pass.